Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
  • A61K8/35—Ketones, e.g. benzophenone
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/40—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing nitrogen
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K8/00—Cosmetics or similar toiletry preparations
  • A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
  • A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
  • A61K8/49—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds
  • A61K8/494—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing heterocyclic compounds with more than one nitrogen as the only hetero atom
  • A61K8/496—Triazoles or their condensed derivatives, e.g. benzotriazoles
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
  • A61Q17/00—Barrier preparations; Preparations brought into direct contact with the skin for affording protection against external influences, e.g. sunlight, X-rays or other harmful rays, corrosive materials, bacteria or insect stings
  • A61Q17/04—Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/16—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms condensed with carbocyclic rings or ring systems
  • C07D249/18—Benzotriazoles
  • C07D249/20—Benzotriazoles with aryl radicals directly attached in position 2

Definitions

• the present invention relates to novel benzotriazoles and to novel topical compositions comprising these benzotriazoles. Furthermore, the invention relates to the use of the novel benzotriazoles as photostabilizer and solubiliser for dibenzoylmethane derivatives such as Butyl Methoxydibenzoylmethane.
• UV-B radiation UV-A radiation
• UVA UV-A radiation
• BMDBM exhibits only a limited solubility in the conventional cosmetic oils used for the solubilisation of solid UV-filter substances in order to enable their incorporation into cosmetic preparations (such as e.g. the cosmetic oils C12-15 alkyl benzoate or diisopropyl sebaceate), which is typically less than 20%.
• cosmetic preparations such as e.g. the cosmetic oils C12-15 alkyl benzoate or diisopropyl sebaceate
• sun-care products containing high amounts BMDBM require high amounts of such cosmetic oils in order to solubilize BMDBM and avoid a re-crystallization in the product, which in turn, however, often results in an unpleasant oily gritty and/ or tacky skin feel of the final products and a reduction in UV protection performance.
• BMDBM is photoinstable i.e. is degraded relatively quickly under the action of sunlight and, as a result, lose its protective action.
• novel benzotriazoles fulfill the above mentioned requirements as they are accessible in good yields by means of simple industrial processes. Furthermore, the novel benzotriazoles efficiently stabilize BMDBM, are either liquid or well soluble in cosmetic oils such as in particular in Myritol 318 [INCI Capric/Caprylic Triglyceride] or Finsolv TN [INCI C12-15 Alkylbenzoate] and act as solubilizer for BMDBM which allows a reduction of the total amount of cosmetic oils.
• R 1 is hydrogen; Ci -3 oalkyl; Ci -5 alkoxy; Ci -5 alkoxycarbonyl; C 5 - 7 cycloalkyl; C 6 -ioaryl or aralkyl;
• R 2 is hydrogen; Ci -3 oalkyl; Ci -5 alkoxy; Ci -5 alkoxycarbonyl; C 5 - 7 cycloalkyl; C 6 -ioaryl or aralkyl;
• R 3 is hydrogen; Ci -5 alkyl; Ci -5 alkoxy or halogen, preferably hydrogen, CI or hydroxy;
• R 4 is hydrogen or Ci -5 alkyl
• R 5 is Ci- 3 oalkyl or C 5 -iocycloalkyl.
• R is hydrogen; Ci -3 oalkyl; Ci -5 alkoxy; Ci -5 alkoxycarbonyl; C 5 -7cycloalkyl; C 6 -ioaryl or aralkyl; R 3 is hydrogen; Ci -5 alkyl; Ci -5 alkoxy or halogen, preferably hydrogen or CI, most preferably hydrogen;
• R 4 is hydrogen or Ci -5 alkyl
• R 5 is Ci- 3 oalkyl or C 5 -iocycloalkyl.
• R 2 is hydrogen or C 1-12 alkyl, preferably C 1-4 alkyl, most preferably methyl;
• R 4 is hydrogen or C 1-2 alkyl; preferably hydrogen and
• R 5 is C 1-12 alkyl or C 5-7 cycloalkyl, preferably C 5-10 alkyl or C 6 cycloalkyl such as most preferably C 6- ioalkyl or C 6 cycloalkyl.
• R 2 is methyl
• R 4 is hydrogen and R 5 is C 5 -ioalkyl or C 6 cycloalkyl such as C 6 -ioalkyl or C 6 cycloalkyl such as in particular 2,5,5-trimethylhexyl, 3,5,5-trimethylhexyl, isoamyl, 2-ethylhexyl or 3,3,5-trimethyl- cyclohexyl.
• C 1-30 alkyl (encompassing C 1-2 alkyl, C 1-5 alkyl, C 5-10 alkyl, C 6- ioalkyl, C 1-12 alkyl) denotes to straight-chain or branched alkyl radicals like methyl, ethyl, n-propyl, isopropyl, n-butyl, sec. butyl, tert.
• branched alkyl radicals such as particularly branched C 5- i2alkyl radicals, more particularly branched C 5- ioalkyl radicals such as branched C 6- ioalkyl radicals such as e.g. 2,5,5-trimethylhexyl, 3,5,5-trimethylhexyl, isoamyl or 2-ethylhexyl as the corresponding benzotriazoles exhibit a particularly good solubility in the cosmetic oils Myritol 318 [I NCI : Capric/Caprylic Triglyceride] respectively Finsolv TN [I NCI : C12-15 Alkylbenzoate].
• the invention relates to compounds according to formula (la) such as in particular to compounds according to formula (II) wherein R 5 is a branched alkyl radical such as a branched C 5 -ioalkyl radical such as e.g. 2,5,5-trimethylhexyl, 3,5,5- trimethylhexyl, isoamyl or 2-ethylhexyl.
• R 5 is a branched alkyl radical such as a branched C 5 -ioalkyl radical such as e.g. 2,5,5- trimethylhexyl, 3,5,5-trimethylhexyl, isoamyl or 2-ethylhexyl.
• C 5-10 cycloalkyl (encompassing C 5-7 cycloalkyl and C 6 cycloalkyl) denotes to unsubstituted or C 1-10 alkyl, in particular C 1-5 alkyl substituted cyclic, bicyclic or tricyclic hydrocarbon residues such as in particular cyclopentyl, cyclohexyl, cycoheptyl or decahydronaphtyl.
• C 5 -iocycloalkyl (encompassing C 5 - 7 cycloalkyl and C 6 cycloalkyl) denotes to unsubstituted or Ci -2 alkyl substituted cyclopentyl, cyclohexyl or cycoheptyl such as in particular to unsubstituted or methyl substituted cyclohexyl such as most in particular cyclohexyl or 3,3,5-trimethyl-cyclohexyl.
• Particularly preferred are methyl substituted cyclohexyl radicals such as particularly 3,3,5-trimethylcyclohexyl.
• the invention relates to compounds according to formula (la) such as in particular to compounds according to formula (II) wherein R 5 is a methyl substituted cyclohexyl radical such as particularly 3,3,5-trimethylcyclohexyl.
• R 5 is a methyl substituted cyclohexyl radical such as particularly 3,3,5-trimethylcyclohexyl.
• the invention relates to compounds of formula (II) wherein R 2 is methyl; R 4 is hydrogen and R 5 is a methyl substituted cyclohexyl such as particularly 3,3,5-trimethylcyclohexyl.
• C 1-5 alkoxy is for example methoxy, ethoxy, propoxy, butyloxy or pentyloxy.
• C 6 -ioaryl is for example naphthyl or phenyl, preferably phenyl.
• the present invention encompasses the optically pure isomers or pure enantiomers as well as mixtures of different isomers, e.g. racemates, and/or mixtures of rotamers. If applicable, mixtures of different isomers, e.g. racemates, and/or mixtures of rotamers are preferred.
• the benzotriazoles according to the present invention are accessible in high yields by a simple two step synthesis using readily available raw materials as depicted below by chloroalkylation of a benzotriazole of formula (III) with an appropriate aldehyde R 4 CHO followed by conversion of the obtained chloroalkylated benzotriazole with the respective alcohol to the corresponding benzotriazoles according to the present invention:
• the invention also relates to a process for the preparation of benzotriazoles according to the invention comprising the steps of
• R 1 is hydrogen; C 1-30 alkyl; C 1-5 alkoxy; C 1-5 alkoxycarbonyl; C 5-7 cycloalkyl; C 6- ioaryl or aralkyl;
• R 2 is hydrogen; C 1-30 alkyl; C 1-5 alkoxy; C 1-5 alkoxycarbonyl; C 5-7 cycloalkyl; C 6- ioaryl or aralkyl;
• R 3 is hydrogen; Ci -5 alkyl; Ci -5 alkoxy or halogen, preferably hydrogen, CI or hydroxy;
• R 4 is hydrogen or Ci -5 alkyl
• R 5 is Ci- 3 oalkyl or C 5 -iocycloalkyl.
• Suitable aldehydes R 4 CHO to be used in the process according to the invention encompass in particular formaldehyde and acetaldehyde and sources of formaldehyde such as paraformaldehyde or hexamethylenetetramine. Particularly preferred is the use of formaldehyde and sources of formaldehyde such as paraformaldehyde or hexamethylenetetramine.
• Particular suitable benzotriazoles of formula (III) are 2-(2H-benzotriazol-2-yl)-4-methyl- phenol, 2-(2H-benzotriazol-2-yl)-4-(2-hydroxy-ethyl)-phenol, 2-(2H-benzotriazol-2-yl)-4- (1 , 1 ,3,3-tetramethyl-butyl)-phenol, and 2-(2H-benzotriazol-2-yl)-4-tert-butyl-phenol.
• Particular suitable alcohols R 5 OH in the process according to the present invention are methanol, ethanol, n-propanol, i-propanol, 1-butanol, 2-butanol, tert.-butanol, 2-ethyl-1- butanol, 2-methyl-1-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 4-methyl-2-pentanol, 3-methyl-1-pentanol, 2-methyl-1 -pentanol, 1- hexanol, 2-hexanol, 3-hexanol, 2-methyl-3- hexanol, 5-methyl-2-hexanol, 5-methyl-1 -hexanol, 2,2-dimethyl-3-hexanol, 4-ethyl-3- hexanol, 3-methyl-1 -hexanol, 2,5-dimethyl-3-hexanol, 1- heptanol, 2- heptan
• branched alkyl alcohols such as branched C 5 -i 2 alcohols, in particular branched C 5- io alcohols or even branched C 6- io alcohols such as e.g. isoamylalcohol, 2,5,5-trimethylhexan-1-ol,
• methyl substituted cyclohexanols such as e.g. 3,3,5-trimethylcyclohexanol.
• the chloroalkylation can be performed according to known methods for reacting aromatic compounds with hydrogen chloride and an appropriate aldehyde in the presence of a Lewis acid or a proton acid as a catalyst or mixtures thereof.
• the amount of aldehyde employed in the chloroalkylation reaction may be the stoichiometric amount, i.e., the amount which provides one R 4 group per benzotriazole. Preferably a slight excess is used in order to achieve full conversion and good yields.
• zinc chloride is used as catalyst and the reaction is carried out in acetic acid.
• the reaction temperature may vary from about 70°C to 130°C. Preferably, the reaction temperature ranges from about 70°C to 100 °C, even more preferably from about 65-85°C.
• the amount of hydrogen chloride used in the reaction is usually at least about one mol equivalent, based on the amount of the benzotriazole; and it is generally introduced by bubbling it through the reaction mixture or by pressurizing the reaction vessel with it.
• the ether formation may be performed by nucleophilic substitution of the chloride with an alkoxide (Williamson ether synthesis).
• the alkoxides are usually prepared immediately prior to the reaction, or are generated in situ from the respective alcohol with a base such as e.g. a carbonate base, a phase transfer catalyst, potassium hydroxide, potassium tert. butylate, dipotassium hydrogenphosphate, sodium, sodium methoxide or sodium hydride such as in particular an alkali metal and/or alkaline earth metal carbonate or bicarbonate such as particularly sodium carbonate, potassium carbonate or lithium carbonate, potassium tert. butylate, sodium hydride, sodium, sodium methylate or dipotassium hydrogenphosphate.
• a base such as e.g. a carbonate base, a phase transfer catalyst, potassium hydroxide, potassium tert. butylate, dipotassium hydrogenphosphate, sodium, sodium methoxide or sodium hydride such as in particular an alkali metal and/or
• a wide range of solvents can be used in the process according to the present invention such as in particular toluene, acetonitrile, N,N-dimethylformamide, tetrahydrofuran or dioxane.
• the reaction is carried out in an excess of the corresponding alcohol R 5 -OH itself.
• the reaction according to the present invention is carried out in toluene, dioxane or tetrahydrofuran.
• the reaction is conducted at 50-100°C and is complete in 1-15 hours. Catalysis is not usually necessary however, if deemed appropriate; the rate of reaction can be further improved by the addition of a catalytic quantity of a soluble iodide.
• silver salts may be added for example silver oxide.
• Each reaction of the process according to the invention can in principle be carried out in any reactor suitable for the respective reaction type. Without restricting generality, the following are mentioned by way of example: suspension reactor, stirred tank, stirred tank cascade, tubular reactor, shell-type reactor, shell and tube reactor, fixed-bed reactor, fluidized-bed reactor, reactive distillation column.
• the benzotriazoles according to the present invention are useful to act as solubiliser for solid, oil soluble UV-filter substances such as BMDBM, bis-ethylhexyloxyphenol methoxyphenyl triazine, benzophenone-3, drometrizole trisiloxane, ethylhexyl triazone, diethylhexyl butamido triazone, 4-methyl benzylidene camphor or 2-(4-Diethylamino-2- hydroxy-benzoyl)-benzoic acid hexylester, in particular BMDBM in cosmetic oils suitable as solvents for such solid, oil soluble UV-filter substances and suitable for the preparation of topical compositions such as in particular in C12-15 alkyl benzoate, caprylic/capric triglyceride, dicaprylyl carbonate or diisopropyl sebacate. Furthermore, the benzotriazoles according to the present invention efficiently stabilize BMDBM from photo-degradation.
• the benzotriazoles according to the invention are useful as UV filter substances, i.e. for protecting ultraviolet-sensitive organic materials, in particular the skin and hair of humans and animals from the harmful effects of UV radiation.
• the benzotriazoles according to the present invention are not only suitable for "immediate protection from acute sun damage” such as sun burn (sun erythema), but also protect against damages through sunlight-induced oxidative stress and/or immune suppression and/or their consequences, i.e. photo aging.
• the benzotriazoles according to the present invention are also suitable to protect natural or artificial hair color.
• the benzotriazoles according to the present invention also lead to a synergistic UV-light absorption if used in combination with at least one further UV-filter substance.
• the benzotriazoles according to the present invention are suitable to reduce the stickiness e.g. of sand on the skin as well as to enhance the water resistance.
• the benzotriazoles according to the present invention are colorless or yellowish, liquid, crystalline or semi-liquid substances.
• the benzotriazoles according to the present invention are liquid non-crystalline substances. They are distinguished by high photostability, good solubility in organic solvents, especially cosmetic solvents such as in particular in C12-15 alkyl benzoate (e.g., FINSOLV TN [Finetex Inc.]), caprylic/capric triglyceride, dicaprylyl carbonate or diisopropyl sebacate, and a short and economical synthetic route.
• C12-15 alkyl benzoate e.g., FINSOLV TN [Finetex Inc.]
• caprylic/capric triglyceride dicaprylyl carbonate or diisopropyl sebacate
• a short and economical synthetic route e.g., FINSOLV TN [Finetex Inc.]
• the benzotriazoles according to the present invention can be easily incorporated into topical compositions such as sunscreens.
• the present invention also relates to compositions, preferably to topical compositions comprising a benzotriazole according to the present invention and a cosmetically or pharmaceutically acceptable carrier.
• the amount of the benzotriazole in the compositions according to the invention is not critical. Preferably an amount of at least 0.01 wt.-% is used. More preferably an amount of 0.5 to 20 wt.-%, in particular 1 to 10 wt.-% such as e.g. from about 2 to 10 wt.-% based on the total weight of the composition is incorporated into the compositions.
• compositions according to the invention further comprise an additional amount of an oil soluble, solid UV-filter substance.
• oil soluble, solid UV-filter substances are in particular butyl methoxydibenzoylmethane (BMDBM), bis- ethylhexyloxyphenol methoxyphenyl triazine (BEMT), benzophenone-3, drometrizole trisiloxane, ethylhexyl triazone, diethylhexyl butamido triazone, 4-methyl benzylidene camphor or 2-(4-Diethylamino-2-hydroxy-benzoyl)-benzoic acid hexylester as well as mixtures thereof.
• BDBM butyl methoxydibenzoylmethane
• BEMT bis- ethylhexyloxyphenol methoxyphenyl triazine
• benzophenone-3 drometrizole trisiloxane
• the topical composition according to the invention further comprises BMDBM as oil soluble, solid UV-filter substance in an amount of at least 0.01 wt.-%.
• the topical composition comprises BMDBM in an amount of 0.5 to 5 wt.-%, most in particular in an amount of 2 to 5 wt.-% based on the total weight of the composition. It is further advantageous if the compositions further comprise an effective amount of octocrylene.
• the topical composition according to the invention further comprises bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of at least 0.01 wt.-%.
• the topical composition comprises bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of 0.5 to 5 wt.-%, most in particular in an amount of 1 to 3 wt.-% based on the total weight of the composition. It is further advantageous if the compositions further comprise an effective amount of octocrylene.
• Suitable amounts of octocrylene may range from 0.5 to 20 wt.-%, such as from 1 to 10 wt.-% with respect to the total weigh of the composition. It is also particularly advantageous if the topical composition according to the present invention comprises as solid UV absorbers BMDBM and bis-ethylhexyloxyphenol methoxyphenyl triazine in the amounts given above. Particularly BMDBM is incorporated in an amount of 2 to 5 wt.-% and bis-ethylhexyloxyphenol methoxyphenyl triazine in an amount of 1 to 3 wt.-% based on the total weight of the composition. Suitable amounts of octocrylene may range from 0.5 to 20 wt.-%, such as from 1 to 10 wt.-% with respect to the total weigh of the composition.
• the invention relates to a topical composition according to the invention comprising a benzotriazole with the definitions and preferences as outlined above which further comprises octocrylene in an amount of at least 0.01 wt.-%.
• octocrylene is present in an amount of 0.5 to 10 wt.-%, most in particular in an amount of 2 to 8 wt.-% based on the total weight of the composition.
• BMDBM in an amount of at least 0.01 wt.-%, such as particularly 0.5 to 5 wt.-%, most in particular 2 to 5 wt.-% based on the total weight of the composition into a composition comprising a benzotriazole according to the invention and octocrylene
• UV-filter substances may show a synergistic effect.
• additional UV-filter substances are advantageously selected from among acrylates such as 2-ethylhexyl 2-cyano-3,3-diphenylacrylate (octocrylene, PARSOL ® 340), ethyl 2-cyano-3,3-diphenylacrylate and the like; camphor derivatives such as 4-methyl benzylidene camphor (PARSOL ® 5000), 3-benzylidene camphor, camphor benzalkonium methosulfate, polyacrylamidomethyl benzylidene camphor, sulfo benzylidene camphor, sulphomethyl benzylidene camphor, therephthalidene dicamphor sulfonic acid and the like; cinnamate derivatives such as ethylhexyl methoxycinnamate (PARSOL ® 5000), 3-benzylidene camphor, camphor benzalkonium m
• 2-phenyl benzimidazole sulfonic acid and its salts PARSOL ® HS.
• Salts of 2-phenyl benzimidazole sulfonic acid are e.g. alkali salts such as sodium- or potassium salts, ammonium salts, morpholine salts, salts of primary, sec. and tert.
• salicylate derivatives such as isopropylbenzyl salicylate, benzyl salicylate, butyl salicylate, ethylhexyl salicylate (PARSOL ® EHS, Neo Heliopan ® OS), isooctyl salicylate or homomenthyl salicylate (homosalate, PARSOL ® HMS, Neo Heliopan ® HMS) and the like; triazine derivatives such as ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone (Uvasorb ® HEB), 2,4,6-Tris-(biphenyl)1 ,3,5- triazine and the like, merocyanines as
• encapsulated UV-filters such as encapsulated ethylhexyl methoxycinnamate (Eusolex ® UV-pearls) or microcapsules loaded with UV-filters as e.g.
• dibenzoylmethane derivatives such as 4-tert.-butyl-4'-methoxydibenzoyl-methane (PARSOL ® 1789) or isopropyldibenzoylmethane and the like
• benzotriazole derivatives such as 2,2'-methylene- bis-(6-(2H-benzotriazole-2-yl)-4-(1 , 1 ,3,3,-tetramethylbutyl)-phenol (Tinosorb ® M) and the like; bis-ethylhexyloxyphenol methoxyphenyl triazine (Tinosorb ® S) and the like
• phenylene- 1 ,4-bis-benzimidazolsulfonic acids or salts such as 2,2-(1 ,4-phenylene)bis-(1 H- benzimidazol-4,6-disulfonic acid) (Neo Heliopan ® AP); amino
• microparticulated refers to a particle size from about 5 nm to about 200 nm, particularly from about 15 nm to about 100 nm.
• the pigments may also be coated by other metal oxides such as e.g. aluminum or zirconium oxides or by organic coatings such as e.g. polyols, methicone, aluminum stearate, alkyl silane. Such coatings are well known in the art.
• the pigments (ZnO, Ti0 2 ) can be used in the form of commercially available oily or aqueous pre-dispersions. These pre- dispersions may further contain a dispersing aid and/ or solubilisator.
• UV-filter substances to be used in combination with a benzotriazole are the commercially available and widely used UV-filter substances octocrylene (PARSOL ® 340), 4-methyl benzylidene camphor (PARSOL ® 5000), ethylhexyl methoxycinnamate (PARSOL ® MCX), ethylhexyl triazone (Uvinul ® T-150), diethylhexyl butamido triazone (Uvasorb ® HEB), 2,2'-methylene-bis-(6-(2H- benzotriazole-2-yl)-4-(1 ,1 ,3,3,-tetramethylbutyl)-phenol (Tinosorb ® M), bis-ethylhexyl- oxyphenol methoxyphenyl triazine (Tinosorb ® S), 2,2-(1 ,4-phenylene)bis-(1 H-benzimide
• UV-filters are e.g. the combination of a benzotriazole according to the invention, octocrylene, BMDBM and 2-(4-Diethylamino-2-hydroxy-benzoyl)-benzoic acid hexylester; a benzotriazole according to the invention, octocrylene, BMDBM, bis-ethylhexyl- oxyphenol methoxyphenyl triazine and 2,2'-methylene-bis-(6-(2H-benzotriazole-2-yl)-4- (1 , 1 ,3,3,-tetramethylbutyl)-phenol as well as the combination of a benzotriazole according to the invention with a pigment such as microparticulated ZnO or Ti0 2 such as in particular PARSOL ® TX.
• a pigment such as microparticulated ZnO or Ti0 2 such as in particular PARSOL ® TX.
• the additional UV-filter substances are generally present in the compositions according to the invention in proportions ranging from 0.1 to 30 wt.-%, preferably ranging from 0.2 to 15 wt.-%, most preferably ranging from 0.5 to 10 wt.-% with respect to the total weigh of the composition.
• the invention also relates to topical compositions according to the invention which next to a dibenzoylmethane derivative such as in particular BMDBM also contain an effective amount of a further stabilizer.
• effective amount of a stabilizer refers to an amount suitable for the photostabilization of a dibenzoylmethane derivative.
• the amount may vary from stabilizer to stabilizer (e.g. based on the mode of action) and can easily been determined by a person skilled in the art with normal trials, or with the usual considerations regarding the formulation of cosmetic composition. Suitable amounts may range from 0.01 to 1 wt.-% as well as from 0.5 to 20 wt.-%, such as 1 to 10 wt.-% with respect to the total weigh of the composition.
• Suitable stabilizers next to the benzotriazoles according to the present invention include octocrylene, diethylhexyl-2,6-naphthalate, polyester-8, diethylhexyl syringylidenemalonat, butyloctyl salicylate, polysilicone-15, tris(tetramethylhydroxypiperidinol)citrate, benzotriazolyl dodecyl p-cresol, benzophenone-3, 4-methylbenzylidene camphor, Methoxycrylene (Solastay S1 ) and/ or bis ethylhexyloxyphenol methoxyphenyl triazine.
• Particularly suitable as stabilizer is octocrylene.
• the invention also relates to a topical composition
• a topical composition comprising a benzotriazole according to the invention, BMDBM and octocrylene or Methoxycrylene, in particular octocrylene, preferably the benzotriazole is used in an amount of 0.5 to 20 wt.-%, BMDBM in an amount of 2 to 5 wt.-% and octocrylene in an amount of 2 to 10 wt.-%.
• the topical compositions according to the present invention are free of p-methylbenzylidene camphor.
• the topical compositions according to the present invention furthermore contain one or more preservatives such as e.g. Methylparabene, Ethylparabene, Propylparabene or Butylparabene, Isobutylparabene, Benzoic Acid and its salts (e.g. Sodium Benzoate), Sorbic Acid and its salts (e.g.
• preservatives such as e.g. Methylparabene, Ethylparabene, Propylparabene or Butylparabene, Isobutylparabene, Benzoic Acid and its salts (e.g. Sodium Benzoate), Sorbic Acid and its salts (e.g.
• Potassium Sorbate Dehydracetic Acid and its salts, Bronopol, Triclosan, Imidazolidinyl Urea, Phenoxyethanol, Benzyl Alcohol, Methylchloroisothiazolinone, Methylisothiazolinone, Chlorphenesin, Ethylhexylglycerin, lodopropinylbutylcarbamate or Pentylene Glycol as well as mixtures thereof and without being limited thereto.
• a total content of about 0.01 to 2 wt.-%, such as in particular 0.05 to 1 wt.-% of preservatives with respect to the total weight of the composition is preferred.
• the topical compositions according to the present invention may in particular contain further ingredients such as moisturizers; anti-oxidants; insect repellents; ingredients for skin lightening, tanning prevention and/ or treatment of hyperpigmentation; tanning agents, ingredients for preventing or reducing wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics.
• further ingredients such as moisturizers; anti-oxidants; insect repellents; ingredients for skin lightening, tanning prevention and/ or treatment of hyperpigmentation; tanning agents, ingredients for preventing or reducing wrinkles, lines, atrophy and/or inflammation; as well as topical anesthetics.
• moisturizers for the incorporation into the topical compositions according to the invention are glycerin, lactic acid and/ or lactates, in particular sodium lactate, butylene glycol, propylene glycol, biosaccaride gum-1 , glycine soja, ethylhexyloxyglycerin, pyrrolidoncarboxy acid, hydroxyethylurea and urea.
• polymeric moisturizer such as water soluble or water gelifiable polysaccharides.
• advantageous are e.g.
• the moisturizers can also be used as anti-ageing ingredients such as e.g. for the treatment of photo-aged skin.
• the topical compositions according to the invention preferably contain at least one moisturizer in an amount (in total) of 0.1 to 20 wt.-%, preferably 0.5 to 10 wt.-% based on the total weight of the composition.
• Particularly suited antioxidants for the topical compositions according to the invention encompass vitamin E and its derivatives such as particularly tocopheryl acetate.
• Tocopheryl acetate may be present in the topical compositions in an amount from about 0.05 wt.-% to 25 wt.-%, in particular 0.05 wt.-% to 5 wt.-%.
• Another vitamin E derivative of interest is tocopheryl linoleate.
• Tocopheryl linoleate may be present in the topical composition in an amount from about 0.05 wt.-% to 25 wt.-% in particular 0.05 wt.-% to 5 wt.-%.
• vitamin A and/or its derivatives Another suitable antioxidant is vitamin A and/or its derivatives.
• retinoid derivatives such as retinyl palmitate or retinyl propionate is used in the topical compositions according to the invention in an amount of 0.01 to 5 wt.-%, in particular 0.01 to 0.3 wt.-%.
• the vitamin A and/ or its derivatives can also be used in an encapsulated form.
• Vitamin C ascorbic acid
• ascorbyl phosphate such as Stay C (sodium ascorbyl monophosphate) Mg ascorbylphosphate and or Ascorbylglucoside is used in the topical compositions according to the invention in an amount of 0.1 to 5 wt.-% in particular 0.1 to 2 wt.-%.
• Suitable insect repellents include N,N-Diethyl-3-methylbenzamid (Meta-delphene, "DEET”), Dimethylphtalat (Palatinol M, DMP), 1-Piperidincarbonsaure-2-(2-hydroxyethyl)-1- methylpropylester as well as particularly 3-(N-n-Butyl-N-acetyl-amino)-propionic acid (available as Insect Repellent ® 3535 at Merck) as well as mixtures thereof.
• DEET N,N-Diethyl-3-methylbenzamid
• DMP Dimethylphtalat
• 1-Piperidincarbonsaure-2-(2-hydroxyethyl)-1- methylpropylester as well as particularly 3-(N-n-Butyl-N-acetyl-amino)-propionic acid (available as Insect Repellent ® 3535 at Merck) as well as mixtures thereof.
• Suitable skin lightening (depigmentation) agents to be used in the topical compositions according to the invention encompass alpha-arbutin, resveratrol, hydroquinone, azelaic acid, kojic acid as well as ascorbyl phosphates such as Magnesium-/, -ascorbyl-2- phosphate (MAP), sodium ascorbyl monophosphate or ascorbylglucoside
• Suitable tanning agents are dihydroxyacetone, erythrulose and/ or melanine derivates in an amount of 1 to 10 wt.-% based on the total weight of the composition according to the invention.
• cosmetically active ingredients suitable to be used in the topical composition according to the invention comprise peptides (e.g., MatrixylTM [pentapeptide derivative]), oligopeptides, wax-based synthetic peptides (e.g., octyl palmitate and tribehenin and sorbitan isostearate and palmitoyl-oligopeptide), glycerol, alpha-glycosylrutin, natural or synthetic flavanoids or isoflavanoids, creatine, creatinine, guanidine (e.g.
• vitamin C ascorbic acid
• vitamin A e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate
• vitamin E e.g., tocopherol acetate
• vitamin B 3 e.g. niacinamide
• vitamin B 5 e.g. panthenol
• vitamin B 6 and vitamin B 12 biotin, folic acid
• anti-acne actives or medicaments e.g. resorcinol, salicylic acid, and the like
• antioxidants e.g. phytosterols, lipoic acid
• flavonoids e.g.
• isoflavones, phytoestrogens skin soothing and healing agents such as aloe vera extract, allantoin and the like; agents suitable for aesthetic purposes such as essential oils, fragrances, skin sensates, opacifiers, aromatic compounds (e.g., clove oil, menthol, camphor, eucalyptus oil, and eugenol), desquamatory actives, hydroxy acids such as AHA acids, poly unsaturated fatty acids, radical scavengers, farnesol, antifungal actives in particular bisabolol, alkyldiols such as 1 ,2-pentanediol, hexanediol or 1 ,2-octanediol, phytol, polyols such as phytanetriol, ceramides and pseudoceramides, amino acids, protein hydrolysates, polyunsaturated fatty acids, plant extracts like kinetin, DNA or RNA and their fragmentation products, carbohydrates,
• the additional cosmetically active ingredient is typically included in an amount of at least 0.001 wt.-% based on the total weight of the topical composition. Generally, an amount of about 0.001 wt.-% to about 30 wt.-%, preferably from about 0.001 wt.-% to about 10 wt.-% of an additional cosmetically active agent is used.
• Particularly preferred examples of ingredients to be used in the compositions according to the invention are vitamin C (ascorbic acid) and/or its derivatives (e.g.
• vitamin A and/or its derivatives e.g., retinoid derivatives such as retinyl palmitate or retinyl propionate
• vitamin E and/or its derivatives e.g., tocopherol acetate
• vitamin B 6 vitamin B biotin and/ or co-enzyme Q10.
• the topical cosmetic compositions of the invention can also contain usual cosmetic or pharmaceutical adjuvants and additives, such as preservatives, film forming agents, antioxidants, fatty substances/ oils and/ or waxes, water, organic solvents, silicones, thickeners, softeners, emulsifiers, antifoaming agents, aesthetic components such as fragrances, surfactants, fillers, sequestering agents, anionic, cationic, nonionic or amphoteric polymers or mixtures thereof, propellants, acidifying or basifying agents, complexing agents, dyes, colorings/colorants, abrasives, absorbents, essential oils, skin sensates, astringents, perfumes or any other ingredients usually formulated into cosmetic compositions such as alcohols, polyols or electrolytes.
• cosmetic adjuvants and additives such as preservatives, film forming agents, antioxidants, fatty substances/ oils and/ or waxes, water, organic solvents, silicones, thickeners, softeners, e
• Such cosmetic ingredients commonly used in the skin care industry, which are suitable for use in the compositions of the present invention are e.g. described in the CTFA Cosmetic Ingredient Handbook, Second Edition (1992) without being limited thereto.
• the necessary amounts of the cosmetic and pharmaceutical adjuvants and additives can - based on the desired product form- easily be chosen by a skilled person in this field and will be illustrated in the examples, without being limited hereto.
• the usual cosmetic adjuvants and additives such as e.g. emulsifiers, thickeners, surface active ingredients and film formers can show synergistic effects which can be determined by the expert in the field with normal trials, or with the usual considerations regarding the formulation of cosmetic composition.
• the fatty substances can be an oil or a wax, or mixtures thereof.
• oils are mineral oils (liquid paraffin); vegetable oils (sweet almond, macadamia, blackcurrant seed or jojoba oil); synthetic oils, such as perhydrosqualene, fatty alcohols, acids or esters (such as the C12-15 alkyl benzoate marketed under the trademark "Finsolv TN” by Finetex, octyl palmitate, isopropyl lanolate or triglycerides, including those of capric/caprylic acids), or oxyethylenated or oxypropylenated fatty esters and ethers; silicone oils (cyclomethicone, polydimethylsiloxanes or PDMS); fluorinated oils; polyalkylenes and their mixtures.
• mineral oils liquid paraffin
• vegetable oils sweet almond, macadamia, blackcurrant seed or jojoba oil
• synthetic oils such as perhydrosqualene, fatty alcohols, acids or esters (such as the C12-15 alkyl benzoate marketed under
• oils used in the compositions according to the invention are selected from the list of polar oils such as the lecitines and fatty acid triglycerides, namely triglycerinester of saturated or unsaturated, branched or linear alkanoic acids with a chain length of 8 to 24, particularly 12 to 18C-atoms.
• the fatty acid triglycerides may preferably be selected from the group of synthetic, semi synthetic and natural oils such as e.g. cocoglyceride, olive oil, sunflower oil, soy bean oil, peanut oil, palm oil, sweet almond oil macadamia oil, coconut oil etc.
• polar oils may be selected from the group of esters of saturated or unsaturated, branched or linear alkanoic acids with a chain length of 3 to 30 C-atoms and saturated or unsaturated, branched or linear alcohols with a chain length of 3 to 30C-atoms as well as from the group of esters from aromatic carbonic acids and saturated or unsaturated, branched or linear alcohols with a chain length of 3 to 30C-atoms.
• ester oils are particularly selected from the group of phenylethylbenzoate, octylpalmitate, octylcocoate, octylisostearate, octyldodeceylmyristate, octyldodecanol, cetearylisononanoate, isopropylmyristate, isopropylpalmitate, isopropylstearate, isopropyloleate, n-butylstearate, n-hexyllaurate, n-decyloleate, isooctylstearate, isononylstearate, isononylisononanoate, 2-ethylhexylpalmitate, 2- ethylhexyllaurate, 2-hexyldecylstearate, 2-octyldodecylpalmitate, stearylhept
• suitable oils may be selected from the group of dialkyl ether and dialkylcarbonates such as particularly dicaprylylether (Cetiol OE) and/ or dicaprylylcarbonate, (e.g. available as Cetiol CC at Cognis).
• dialkyl ether and dialkylcarbonates such as particularly dicaprylylether (Cetiol OE) and/ or dicaprylylcarbonate, (e.g. available as Cetiol CC at Cognis).
• oils may be selected from the group of isoeikosan, neopentylglykoldiheptanoate, propylenglykoldicaprylaet caprylate/dicaprate, caprylic/ capric/ diglyceryl succinate, butylene glyckol dicaprylate/dicaprate, Ci 2 -13-Alkyllactate, D1-C12-13- alkyltartrate, triisostearin, dipentaerythrityl hexacaprylate hexacaprate, propylenglykolmonoisostearate, tricaprylin and dimethylisosorbid.
• oil phase of the topical compositions according to the invention contains an amount of Ci 2 -i5-alkylbenzoate or consists essentially thereof.
• oily components are e.g. butyloctylsalicylate (e.g. Hallbrite BHB from CP Hall), hexadecylbenzoate and butyloctylbenzoate as well as mixtures therof (e.g. Hallstar AB).
• the topical compositions according to the present invention may also contain apolar oils such as e.g. branched or linear hydrocarbons and waxes, in particular mineral oil, vaseline (Petrolatum), paraffin oil, squalan and squalen, polyolefins, hydrogenated polyisobutenes, C-13-16 isoparaffin and isohexadecan. Within the group of polyolefins polydecenes are preferred.
• Exemplary waxy compounds in particular suitable for the use in the compositions according to the invention are paraffin wax, carnauba wax, beeswax or hydrogenated castor oil.
• Exemplary organic solvents in particular suitable for the use in the compositions according to the invention include the lower alcohols and polyols having at most 8 carbon atoms.
• the compositions according to the invention comprise ethanol in an amount of 5 to 40 wt.-% based on the total weight of the composition.
• the thickeners are advantageously selected, in particular, from among the cross linked polyacrylic acids or modified or unmodified guar gums and celluloses, such as hydroxypropylated guar gum, methylhydroxyethylcellulose and hydroxypropylmethylcellulose.
• Suitable film forming agents include polymers in the basis of PVP such as in particular copolymers of polyvinylpyrrolidon e.g. PVP hexadecen copolymer and PVP eicosen copolymer which are available as Antaron V216 and Antaron V220 at GAF Chemicals corporations.
• Further suitable film forming agents include polymeric film formers such as sodiumpolystyrenesulfonate (e.g. Flexan 130 from National Starch and Chemical Corp.) and/ or polyisobuten (e.g. Rewopal PIB1000 from Rewo). Further suitable polymers are e.g.
• polyacrylamide (Seppigel 305), polyvinylalkohole, PVP, PVP/VA copolymers, polyglycols and acrylate/octylacralymid copolymers (e.g. Dermacryl 79).
• hydrated castor oil dimerdilinoleat (CAS 646054-62-8, I NCI Hydrogenated Castor Oil Dimer Dilinoleate), or PPG-3 Benzylethermyristate (CAS 403517-45-3).
• compositions according to the invention may further comprise one or several compounds from the group of siloxanes elastomers listed in order to enhance the water resistance and/ or enhance the light protection factor such as in particular siloxanes elastomers in the form of spherical powders with the I NCI nomenclature Dimethicone/Vinyl Dimethicone Crosspolymer, such as e.g. DOW CORNING 9506 Powder (by Dow corning).
• siloxane elastomer is used in combination with hydrocarbon oils, synthetic oils, synthetic esters, synthetic ether or mixtures thereof.
• hydrocarbon oils, synthetic oils, synthetic esters, synthetic ether or mixtures thereof are particularly advantageous.
• one skilled in this art will take care to select the above mentioned optional additional compound or compounds and/or their amounts such that the advantageous properties intrinsically associated with the combination in accordance with the invention are not, or not substantially, detrimentally affected by the envisaged addition or additions.
• the term "topical composition” as used herein refers in particular to a cosmetic composition that can be topically applied to mammalian keratinous tissue, particularly human skin and hair.
• cosmetic preparation or "cosmetic composition” as used in the present application refers to cosmetic compositions as defined under the heading "Kosmetika” in Rompp Lexikon Chemie, 10th edition 1997, Georg Thieme Verlag Stuttgart, New York as well as to cosmetic compositions as disclosed in A. Domsch, "Cosmetic Preparations”, Verlag fur chemische Industrie (ed. H. Ziolkowsky), 4 th edition, 1992.
• Preferred topical compositions according to the invention are skin care preparations, hair care preparations, decorative preparations, and functional preparations.
• Examples of skin care preparations are, in particular, light protective preparations, anti- ageing preparations, preparations for the treatment of photo-ageing, body oils, body lotions, body gels, treatment creams, skin protection ointments, skin powders, moisturizing gels, moisturizing sprays, face and/or body moisturizers, skin-tanning preparations (i.e. compositions for the artificial/sunless tanning and/or browning of human skin), for example self-tanning creams as well as skin lightening preparations.
• light protective preparations i.e. compositions for the artificial/sunless tanning and/or browning of human skin
• care preparations are hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations such as e.g. pretreatment preparations, hair tonics, styling creams, gels such as styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams (hair mousses) and hairsprays.
• hair-washing preparations in the form of shampoos, hair conditioners, hair-care preparations such as e.g. pretreatment preparations, hair tonics, styling creams, gels such as styling gels, pomades, hair rinses, treatment packs, intensive hair treatments, hair- straightening preparations, liquid hair-setting preparations, hair foams (hair mousses) and hairsprays.
• Examples of decorative preparations are, in particular, lipsticks, eye shadows, mascaras, dry and moist make-up formulations, rouges and/or powders.
• Examples of functional preparations are cosmetic or pharmaceutical compositions containing active ingredients such as hormone preparations, vitamin preparations, vegetable extract preparations, anti-ageing preparations, and/or antimicrobial (antibacterial or antifungal) preparations without being limited thereto.
• the topical compositions according to the invention are light- protective preparations, such as sun protection milks, sun protection lotions, sun protection creams, sun protection oils, sun blocks or tropical's or day care creams with a SPF (sun protection factor).
• SPF un protection factor
• topical compositions are hair-washing preparations in the form of shampoos or hair treatment preparations intended to be left in the hair (and not washed out) such as hair-setting preparations, hairsprays, gels, pomades, styling creams or hair foams (hair mousses), particularly hairsprays, gels or hair foams (hair mousses).
• a shampoo may, for example, have the following composition: from 0.01 to 5 wt.-% of a benzotriazole according to the present invention, 12.0 wt.-% of sodium laureth-2-sulfate, 4.0 wt.-% of cocamidopropyl betaine, 3.0 wt.-% of sodium chloride, and water ad 100 wt.-%.
• the topical compositions according to the present invention may be in the form of a suspension or dispersion in solvents or fatty substances, or alternatively in the form of an emulsion or micro emulsion (in particular of O/W- or W/O-type, Si/W- or W/Si-type), PIT- emulsion, multiple emulsion (e.g. 0/W/O- or W/O/W-type), pickering emulsion, hydrogel, alcoholic gel, lipogel, one- or multiphase solution or vesicular dispersion or other usual forms, which can also be applied by pens, as masks or as sprays.
• the topical compositions are in the form of an emulsion or dispersion.
• the topical compositions according to the invention are in the form of an O/W emulsion.
• the topical composition according to the invention contains advantageously at least one O/W- or Si/W-emulsifier selected from the list of glycerylstearatcitrate, glycerylstearate (self emulsifying), stearic acid, salts of stearic acid, polyglyceryl-3-methylglycosedistearate, ceteareth-20, steareth-2, steareth-12, PEG-40 stearate,
• Further suitable emulsifiers are phosphate esters and the salts thereof such as cetyl phosphate (Amphisol ® A), diethanolamine cetyl phosphate (Amphisol ® DEA), potassium cetyl phosphate (Amphisol ® K), sodiumcetearylsulfat, sodium glyceryl oleate phosphate, hydrogenated vegetable gly
• emulsifiers are sorbitan oleate, sorbitan sesquioleate, sorbitan isostearate, sorbitan trioleate, Lauryl Glucoside, Decyl Glucoside, Sodium Stearoyl Glutamate, Sucrose Polystearate and Hydrated Polyisobuten.
• one or more synthetic polymers may be used as an emulsifier.
• PVP eicosene copolymer acrylates/C 10-3 o alkyl acrylate crosspolymer, acrylates/steareth-20 methacrylate copolymer, PEG-22/dodecyl glycol copolymer, PEG-45/dodecyl glycol copolymer, and mixtures thereof.
• the at least one O/W emulsifier is preferably used in an amount of about 0.001 to 10 wt.-%, more preferably in an amount of 0.1 to 7 wt.-% with respect to the total weigh of the composition.
• topical composition contains advantageously at least one co-emulsifier selected from the list of alkyl alcohols such as Cetyl Alcohol (Lorol C16, Lanette 16) Cetearyl Alcohol (Lanette O), Stearyl Alcohol (Lanette 18), Behenyl Alcohol (Lanette 22), Glyceryl Monostearate, Glyceryl Myristate (Estol 3650), Hydrogenated Coco- Glycerides (Lipocire Na10) without being limited to this and mixtures thereof.
• alkyl alcohols such as Cetyl Alcohol (Lorol C16, Lanette 16) Cetearyl Alcohol (Lanette O), Stearyl Alcohol (Lanette 18), Behenyl Alcohol (Lanette 22), Glyceryl Monostearate, Glyceryl Myristate (Estol 3650), Hydrogenated Coco- Glycerides (Lipocire Na10) without being limited to this and mixtures thereof.
• the topical compositions according to the invention are W/O emulsions. If the topical composition according to the invention is a W/O emulsion, then it contains advantageously at least one W/O- or W/Si-emulsifier selected from the list of polyglyceryl-2-dipolyhydroxystearat, PEG-30 dipolyhydroxystearat, cetyl dimethicone copolyol, polyglyceryl-3 diisostearate polyglycerol esters of oleic/isostearic acid, polyglyceryl-6 hexaricinolate, polyglyceryl-4-oleate, polygylceryl-4 oleate/PEG-8 propylene glycol cocoate, magnesium stearate, sodium stearate, potassium laurate, potassium ricinoleate, sodium cocoate, sodium tallowate, potassium castorate, sodium oleate, and mixtures thereof.
• W/O- or W/Si-emulsifier selected from the
• W/Si-emulsifiers are Lauryl Polyglyceryl-3 Polydimethylsiloxyethyl Dimethicone and/or PEG-9 Polydimethylsiloxyethyl Dimethicone and/or Cetyl PEG/PPG-10/1 Dimethicone and/or PEG-12 Dimethicone Crosspolymer and/or PEG/PPG-18/18 Dimethicone.
• the at least one W/O emulsifier is preferably used in an amount of about 0.001 to 10 wt.-%, more preferably in an amount of 0.2 to 7 wt.-% with respect to the total weigh of the composition.
• the topical compositions according to the invention particularly exhibit a pH in the range of 3-10, preferably in the range of pH of 5-8, most preferred in the range of pH 5.5-7.5 which can be adjusted with conventional acids, bases or buffering solutions.
• a typical "leave- on" composition like a skin care emulsion or light-protective preparation, for example, is usually applied in an amount of about 0.5 to about 2mg per cm 2 skin.
• the applied amount is normally not critical, and the desired effect(s) may be achieved by using more of the composition, repeating the application of the composition and/or applying a composition which contains more of the active ingredient(s).
• a topical composition as used herein a topical composition is meant which after having applied to the skin, is not removed intentionally. It is preferably left on the skin for a period of at least about 15 minutes, more preferably at least about 30 minutes, even more preferably at least about 1 hour, most preferably for at least several hours, e. g. up to about 12 hours.
• compositions according to the invention are in particular used for the protection against skin ageing (in particular photo ageing) and as sunscreen.
• Vitamine E Acetate 0.1 0.5 0.5
• 2-(2H-Benzotriazol-2-yl)-4-methyl-phenol (2.3 g, 10 mmol) is dissolved in acetic acid (30 mL) at 80°C.
• Zinc chloride 140 mg, 1 mmol
• paraformaldehyde (390 mg, 13 mmol) are added and HCI gas is passed through the reaction mixture for 12 hours at 80°C.
• the product which precipitates after cooling to room temperature, is filtered off, washed with small amounts of cold ethyl acetate and dried at 60°C under vacuum to yield 1.9 g of 2-(2H- benzotriazol-2-yl)-6-chloromethyl-4-methyl-phenol.
• 2-(2H-Benzotriazol-2-yl)-6-chloromethyl-4-methyl-phenol (10.0 g, 33 mmol) is suspended in a mixture of 2-ethylhexanoic acid (1 1 .9 g, 82 mmol) and tetrahydrofuran (75 g) and stirred at 70°C for 30 minutes.
• Sodium carbonate (10.5 g, 99 mmol) is added.
• the slightly yellow reaction mixture is stirred at 60°C for 15 minutes and evaporated to dryness.
• the residue is dissolved in ethyl acetate and extracted with an aqueous potassium carbonate solution (10%) and brine.
• the organic layer is dried over sodium sulphate, filtered and evaporated to dryness.
• 2-(2H-Benzotriazol-2-yl)-6-chloromethyl-4-(1 , 1 ,3,3-tetramethyl-butyl)-phenol (5.0 g, 13.5 mmol) is suspended in isoamyl alcohol (20.0 g, 227 mmol) and stirred at 80°C for 15 minutes.
• Sodium hydride (0.2 g, 4.3 mmol, 60% in mineral oil) is added.
• the orange reaction mixture is stirred at 80°C for 15 minutes and evaporated to dryness.
• the residue is dissolved in ethyl acetate and extracted with aqueous citric acid (5%) and brine.
• the organic layer is dried over sodium sulphate, filtered and evaporated to dryness.
• BMDBM 80 mg were dissolved in 720 mg C12-15 alkyl benzoate. 1200 mg of ethanol were added. 2 mg/cm 2 of this solution were spread over six roughened glass plates. Three glass plates were stored in the dark while the three others were irradiated with 25 MED (ATLAS Suntester). Afterwards the oil film of each glass plate was separately dissolved in 30 ml_ methanol and the BMDBM content of these solutions quantified by HPLC. In comparison to unexposed films the average recovery of BMDBM after irradiation was determined to be 21 %.
• a cosmetic solvent Capric/Caprylic Triglyceride (Mygliol 318) and C 12- 15 Alkylbenzoate (Finsolv TN)
• a cosmetic solvent Capric/Caprylic Triglyceride (Mygliol 318) and C 12- 15 Alkylbenzoate (Finsolv TN)
• the saturated solution is stirred for 7 days at room temperature.
• 1 ml of the supernatant is centrifuged and filtered in order to obtain a clear solution.
• the concentration of the Benzotriazol-derivative is determined by means of HPLC.
• the alkyl-ether derivatives show a significantly high solubility compared to the corresponding ester derivatives or the bis-ether of example 14.
• Example 20 Solubility of BMDBM in various mixtures of 2-(2H-Benzotriazol-2-yl)-6- (2-ethylhexyloxymethyl)-4-methyl-phenol (1A) and different cosmetic oils.
• the benzotriazole 1A is mixed with the corresponding solvent [w/w] as outlined in table 3 below resulting in clear solutions.
• 5 ml. of the respective mixture are saturated with BMDBM by adding 125 mg (2.5%) portions while stirring at room temperature.
• the saturated solution is stirred for 7 days at room temperature. Afterwards 1 ml. of the supernatant is centrifuged and filtered in order to obtain a clear solution.
• the concentration of BMDBM is determined by means of HPLC according to standard methods.
• the benzotriazole 1A can be used as solubilizer (i.e. replacer of the respective oil) in order to reduce the total amount of cosmetic solvent needed for the dissolution of BMDBM.

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